【Android图像处理】图像处理之-马赛克滤镜

  何为马赛克？

  实现的思路就是选定一定大小的矩形区域，用其中任意一点的像素来填充整个区域，这样就实现了马赛克滤镜。

代码如下：

	//马赛克
	public static Bitmap Masic(Bitmap bitmap){
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		Bitmap result = Bitmap.createBitmap(width,height, Bitmap.Config.RGB_565);
		int[] inPixels = new int[width*height];
		int[] outPixels = new int[width*height];

		bitmap.getPixels(inPixels, 0, width, 0, 0, width, height);
		int index = 0;

		int offsetX = 0, offsetY = 0;
		int newX = 0, newY = 0;
		int size = 10;
		double total = size * size;
		double sumred = 0, sumgreen = 0, sumblue = 0;
		for(int row = 0; row < height; row++) {
			int ta = 0, tr = 0, tg = 0, tb = 0;
			for(int col = 0; col < width; col++) {
				newY = (row / size) * size;
				newX = (col / size) * size;
				offsetX = newX + size;
				offsetY = newY + size;
				for(int subRow = newY; subRow < offsetY; subRow++) {
					for(int subCol = newX; subCol < offsetX; subCol++) {
						if(subRow < 0 || subRow >= height) {
							continue;
						}
						if(subCol < 0 || subCol >= width) {
							continue;
						}
						index = subRow * width + subCol;
						ta = (inPixels[index] >> 24) & 0xff;
						sumred += (inPixels[index] >> 16) & 0xff;
						sumgreen += (inPixels[index] >> 8) & 0xff;
						sumblue += inPixels[index] & 0xff;
					}
				}
				index = row * width + col;
				tr = (int)(sumred / total);
				tg = (int)(sumgreen / total);
				tb = (int)(sumblue / total);
				outPixels[index] = (ta << 24) | (tr << 16) | (tg << 8) | tb;

				sumred = sumgreen = sumblue = 0; // reset them...
			}
		}
		result.setPixels(outPixels, 0, width, 0, 0, width, height);
		return result;
	}

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